Nano-Channel Drop Filter Using Photonic Crystal Ring Resonator for Dense Wavelength Division Multiplexing Systems

In this paper, Photonic Crystal Ring Resonator (PCRR) based channel drop filter is proposed and designed for Dense Wavelength Division Multiplexing (DWDM) systems. The proposed optical filter is devised with bus waveguide, reflector, nanoring resonator and drop waveguide. The periodic and non-periodic structure photonic band gaps are accurately computed by Plane Wave Expansion (PWE) method. The nano-filter performance parameters are evaluated by the Finite-Difference-Time-Domain Method (FDTD). The performance parameters of the channel drop filter are resonant wavelength, spectral width, output efficiency and quality factor. The proposed optical filter drops a channel at a resonant wavelength of 1553 nm with a spectral width of 1.1 nm. The quality factor is 1411.81, and 100% output efficiency is observed. Furthermore, the effect of the reflector, scattering rod radius and number of coupling rods are varied to calculate and optimize the filter performance parameters. The overall chip size of the designed optical filter is around 13.2 m× 13.2 m; hence it is highly suitable for optical integrated circuits.